<template>
    <div class="chartNum">
        <div class="box-item">
            <li :class="{ 'number-item': !isNaN(item), 'mark-item': isNaN(item) }" v-for="(item, index) in orderNum"
                :key="index">
                <span v-if="!isNaN(item)">
                    <i ref="numberItem">0123456789</i>
                </span>
                <span class="comma" v-else>{{ item }}</span>
            </li>
        </div>
    </div>
</template>
<script>
export default {
    data() {
        return {
            orderNum: ['0', '0', '0', '0', '0', '0', '0', '0'], // 默认订单总数
        }
    },
    props: {
        number: {
            type: Number,
            default: 0
        },
    },
    watch: {
        number: {
            handler(val) {
                this.toOrderNum(val);
            },
            immediate: true,
        }
    },
    methods: {
        // 设置文字滚动
        setNumberTransform() {
            this.$nextTick(() => {
                const numberItems = this.$refs.numberItem // 拿到数字的ref，计算元素数量
                const numberArr = this.orderNum.filter(item => !isNaN(item))
                // 结合CSS 对数字字符进行滚动,显示订单数量
                for (let index = 0; index < numberItems.length; index++) {
                    const elem = numberItems[index]
                    elem.style.transform = `translate(-50%, -${numberArr[index] * 10}%)`
                }
            })

        },
        // 处理总订单数字
        toOrderNum(num) {
            num = num.toString()
            // 把订单数变成字符串
            if (num.length < 9) {
                num = '0' + num // 如未满八位数，添加"0"补位
                this.toOrderNum(num) // 递归添加"0"补位
            } else if (num.length === 9) {
                // 订单数中加入逗号
                // num = num.slice(0, 2) + ',' + num.slice(2, 5) + ',' + num.slice(5, 8)
                this.orderNum = num.split('') // 将其便变成数据，渲染至滚动数组
            } else {
                // 订单总量数字超过八位显示异常
                this.$message.warning('总量数字过大')
            }
            this.setNumberTransform()
        },
    }
}
</script>
<style scoped lang='scss'>
/*订单总量滚动数字设置*/
.box-item {
    position: relative;
    height: 3rem;
    font-size: 2rem;
    list-style: none;
    color: #fff;
    writing-mode: vertical-lr;
    text-orientation: upright;
    /*文字禁止编辑*/
    -moz-user-select: none;
    /*火狐*/
    -webkit-user-select: none;
    /*webkit浏览器*/
    -ms-user-select: none;
    /*IE10*/
    -khtml-user-select: none;
    /*早期浏览器*/
    user-select: none;
    /* overflow: hidden; */
}

/* 默认逗号设置 */
.mark-item {
    width: 10px;
    height: 100px;
    margin-right: 5px;
    line-height: 10px;
    font-size: 2rem;
    position: relative;

    &>span {
        position: absolute;
        width: 100%;
        bottom: 0;
        writing-mode: vertical-rl;
        text-orientation: upright;
    }
}

/*滚动数字设置*/
.number-item {
    width: 2rem;
    height: 2rem;
    /* 背景图片 */
    background: url('../../../assets/dataView/leftNum.png') no-repeat center center;
    background-size: 100% 100%;
    list-style: none;
    margin-right: 5px;
    border-radius: 4px;

    &>span {
        position: relative;
        display: inline-block;
        margin-right: 10px;
        width: 100%;
        height: 100%;
        writing-mode: vertical-rl;
        text-orientation: upright;
        overflow: hidden;

        &>i {
            font-style: normal;
            position: absolute;
            // top: 11px;
            left: 50%;
            transform: translate(-50%, 0);
            transition: transform 1s ease-in-out;
            letter-spacing: 10px;
        }
    }
}

.number-item:last-child {
    margin-right: 0;
}
</style>